September 15
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September 15 is the 258th day of the year (259th in leap years) in the Gregorian calendar; 107 days remain until the end of the year.
- 622 CE - Plan of Quraysh to assassinate the Prophet (s) (Safar 29, 1)
- 1249 CE - Birth of al-Hasan b. 'Ali b. Dawud al-Hilli, a Shi'a scholar of rijal, fiqh, Arabic literature, and a poet. (Jumada II 5, 647)